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0.185 g of an iron wire containing 99.8% iron is dissolved in an acid to form ferrous ions. The solution requires 33 mL of $K_{2} {Cr}_{2} O_{7}$ solution for complete reaction. The normality of the $K_{2} {Cr}_{2} O_{7}$ solution is:

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0.05

0.02

0.20

0.10

answer is D.

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Detailed Solution

$\frac{0.185 \times 0.998}{56} = \frac{33 \times N}{1000}$

So, N= 0.10

Thus, the correct option is D.

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